コードを MySQL から MySQLi に変換する方法: ステップバイステップ ガイド

$connection = new mysqli("host", "username", "password", "database_name");

if ($connection->connect_errno) {
    printf("Error: %s\n", $connection->connect_error);
}

$sql_follows = "SELECT * FROM friends WHERE user1_id=? AND status=? OR user2_id=? AND status=?";
$stmt = $connection->prepare($sql_follows);
$stmt->bind_param("iiii", $_SESSION['id'], 2, $_SESSION['id'], 2);
$stmt->execute();
$result = $stmt->get_result();

while ($row = $result->fetch_assoc()) {
    // Do something with the data
}

$result->close();
$stmt->close();
$connection->close();